Instructions:Download the following voucher image and print out:
There was a similar voucher a couple of months back which worked for me. That one appeared to be employer related and on one of the 2 ocassions I was asked by the store who I worked for. The answer was Barclays. Be prepared in case it is the same. This voucher reached me by e-mail but it's original source is unknown to me. Perhaps someone else can enlighten us.
Update: I have been able to confirm that this voucher is intended for employees of large corporations and was e-mailed out to them.